* Moved TAILQ_INSERT* into get_rule to avoid a problem which
caused groups to also be inserted and kept in the rule
list

* Fix several bugs related to config file parsing, including:
- a bug in the argument checker, which caused a SEGFAULT
- a bug that would cause lines beginning with whitespaces
to duplicate their first real token
- an incorrect check for an empty line, which caused a
warning about an incorrect verb instead of ignoring
the line